'use client';

import { useState, useEffect, useRef, useMemo } from 'react';
import { createPortal } from 'react-dom';
import { TaskPriority, TaskStatus } from '@/lib/types';
import { Button } from '@/components/ui/Button';
import { Input } from '@/components/ui/Input';
import { useTasksContext } from '@/contexts/TasksContext';
import { getAllPriorities, getPriorityColorHex } from '@/lib/status-config';
import { SORT_OPTIONS } from '@/lib/sort-config';
import { useColumnVisibility } from '@/hooks/useColumnVisibility';
import { ColumnVisibilityToggle } from './ColumnVisibilityToggle';

export interface KanbanFilters {
  search?: string;
  tags?: string[];
  priorities?: TaskPriority[];
  showCompleted?: boolean;
  compactView?: boolean;
  swimlanesByTags?: boolean;
  swimlanesMode?: 'tags' | 'priority'; // Mode des swimlanes
  pinnedTag?: string; // Tag pour les objectifs principaux
  sortBy?: string; // Clé de l'option de tri sélectionnée
}

interface KanbanFiltersProps {
  filters: KanbanFilters;
  onFiltersChange: (filters: KanbanFilters) => void;
  hiddenStatuses?: Set<TaskStatus>;
  onToggleStatusVisibility?: (status: TaskStatus) => void;
}

export function KanbanFilters({ filters, onFiltersChange, hiddenStatuses: propsHiddenStatuses, onToggleStatusVisibility }: KanbanFiltersProps) {
  const { tags: availableTags, regularTasks } = useTasksContext();
  const { hiddenStatuses: localHiddenStatuses, toggleStatusVisibility: localToggleStatusVisibility } = useColumnVisibility();
  
  // Utiliser les props si disponibles, sinon utiliser l'état local
  const hiddenStatuses = propsHiddenStatuses || localHiddenStatuses;
  const toggleStatusVisibility = onToggleStatusVisibility || localToggleStatusVisibility;
  const [isExpanded, setIsExpanded] = useState(false);
  const [isSortExpanded, setIsSortExpanded] = useState(false);
  const [isSwimlaneModeExpanded, setIsSwimlaneModeExpanded] = useState(false);
  const sortDropdownRef = useRef<HTMLDivElement>(null);
  const swimlaneModeDropdownRef = useRef<HTMLDivElement>(null);
  const sortButtonRef = useRef<HTMLButtonElement>(null);
  const [dropdownPosition, setDropdownPosition] = useState({ top: 0, left: 0 });

  // Fermer les dropdowns en cliquant à l'extérieur
  useEffect(() => {
    function handleClickOutside(event: MouseEvent) {
      if (sortDropdownRef.current && !sortDropdownRef.current.contains(event.target as Node)) {
        setIsSortExpanded(false);
      }
      if (swimlaneModeDropdownRef.current && !swimlaneModeDropdownRef.current.contains(event.target as Node)) {
        setIsSwimlaneModeExpanded(false);
      }
    }

    if (isSortExpanded || isSwimlaneModeExpanded) {
      document.addEventListener('mousedown', handleClickOutside);
      return () => document.removeEventListener('mousedown', handleClickOutside);
    }
  }, [isSortExpanded, isSwimlaneModeExpanded]);

  const handleSearchChange = (search: string) => {
    onFiltersChange({ ...filters, search: search || undefined });
  };

  const handleTagToggle = (tagName: string) => {
    const currentTags = filters.tags || [];
    const newTags = currentTags.includes(tagName)
      ? currentTags.filter(t => t !== tagName)
      : [...currentTags, tagName];
    
    onFiltersChange({ 
      ...filters, 
      tags: newTags.length > 0 ? newTags : undefined 
    });
  };

  const handlePriorityToggle = (priority: TaskPriority) => {
    const currentPriorities = filters.priorities || [];
    const newPriorities = currentPriorities.includes(priority)
      ? currentPriorities.filter(p => p !== priority)
      : [...currentPriorities, priority];
    
    onFiltersChange({ 
      ...filters, 
      priorities: newPriorities.length > 0 ? newPriorities : undefined 
    });
  };

  const handleCompactViewToggle = () => {
    onFiltersChange({ 
      ...filters, 
      compactView: !filters.compactView 
    });
  };

  const handleSwimlanesToggle = () => {
    onFiltersChange({ 
      ...filters, 
      swimlanesByTags: !filters.swimlanesByTags
    });
  };

  const handleSwimlaneModeChange = (mode: 'tags' | 'priority') => {
    onFiltersChange({ 
      ...filters, 
      swimlanesByTags: true,
      swimlanesMode: mode
    });
    setIsSwimlaneModeExpanded(false);
  };

  const handleSwimlaneModeToggle = (event: React.MouseEvent<HTMLButtonElement>) => {
    const button = event.currentTarget;
    const rect = button.getBoundingClientRect();
    setDropdownPosition({
      top: rect.bottom + window.scrollY + 4,
      left: rect.left + window.scrollX
    });
    setIsSwimlaneModeExpanded(!isSwimlaneModeExpanded);
  };

  const handleSortChange = (sortKey: string) => {
    onFiltersChange({ 
      ...filters, 
      sortBy: sortKey
    });
  };

  const handleSortToggle = () => {
    if (!isSortExpanded && sortButtonRef.current) {
      const rect = sortButtonRef.current.getBoundingClientRect();
      setDropdownPosition({
        top: rect.bottom + window.scrollY + 4,
        left: rect.left + window.scrollX
      });
    }
    setIsSortExpanded(!isSortExpanded);
  };

  const handleClearFilters = () => {
    onFiltersChange({});
  };

  const activeFiltersCount = (filters.tags?.length || 0) + (filters.priorities?.length || 0) + (filters.search ? 1 : 0);

  // Calculer les compteurs pour les priorités
  const priorityCounts = useMemo(() => {
    const counts: Record<string, number> = {};
    getAllPriorities().forEach(priority => {
      counts[priority.key] = regularTasks.filter(task => task.priority === priority.key).length;
    });
    return counts;
  }, [regularTasks]);

  // Calculer les compteurs pour les tags
  const tagCounts = useMemo(() => {
    const counts: Record<string, number> = {};
    availableTags.forEach(tag => {
      counts[tag.name] = regularTasks.filter(task => task.tags?.includes(tag.name)).length;
    });
    return counts;
  }, [regularTasks, availableTags]);

  const priorityOptions = getAllPriorities().map(priorityConfig => ({
    value: priorityConfig.key,
    label: priorityConfig.label,
    color: priorityConfig.color,
    count: priorityCounts[priorityConfig.key] || 0
  }));

  // Trier les tags par nombre d'utilisation (décroissant)
  const sortedTags = useMemo(() => {
    return [...availableTags].sort((a, b) => {
      const countA = tagCounts[a.name] || 0;
      const countB = tagCounts[b.name] || 0;
      return countB - countA; // Décroissant
    });
  }, [availableTags, tagCounts]);

  return (
    <div className="bg-[var(--card)]/50 border-b border-[var(--border)]/50 backdrop-blur-sm">
      <div className="container mx-auto px-6 py-4">
        {/* Header avec recherche et bouton expand */}
        <div className="flex items-center gap-4">
          <div className="flex-1 max-w-md">
            <Input
              type="text"
              value={filters.search || ''}
              onChange={(e) => handleSearchChange(e.target.value)}
              placeholder="Rechercher des tâches..."
              className="bg-[var(--card)] border-[var(--border)]"
            />
          </div>

          {/* Menu swimlanes */}
          <div className="flex gap-1">
            <Button
              variant={filters.swimlanesByTags ? "primary" : "ghost"}
              onClick={handleSwimlanesToggle}
              className="flex items-center gap-2"
              title="Mode d'affichage"
            >
              <svg 
                className="w-4 h-4" 
                fill="none" 
                stroke="currentColor" 
                viewBox="0 0 24 24"
              >
                {filters.swimlanesByTags ? (
                  <path strokeLinecap="round" strokeLinejoin="round" strokeWidth={2} d="M4 6h16M4 10h16M4 14h16M4 18h16" />
                ) : (
                  <path strokeLinecap="round" strokeLinejoin="round" strokeWidth={2} d="M7 7h.01M7 3h5c.512 0 1.024.195 1.414.586l7 7a2 2 0 010 2.828l-7 7a2 2 0 01-2.828 0l-7-7A1.994 1.994 0 013 12V7a4 4 0 014-4z" />
                )}
              </svg>
              {!filters.swimlanesByTags 
                ? 'Normal' 
                : filters.swimlanesMode === 'priority' 
                  ? 'Par priorité' 
                  : 'Par tags'
              }
            </Button>
            
            {/* Bouton pour changer le mode des swimlanes */}
            {filters.swimlanesByTags && (
              <Button
                variant="ghost"
                onClick={handleSwimlaneModeToggle}
                className="flex items-center gap-1 px-2"
              >
                <svg 
                  className={`w-3 h-3 transition-transform ${isSwimlaneModeExpanded ? 'rotate-180' : ''}`}
                  fill="none" 
                  stroke="currentColor" 
                  viewBox="0 0 24 24"
                >
                  <path strokeLinecap="round" strokeLinejoin="round" strokeWidth={2} d="M19 9l-7 7-7-7" />
                </svg>
              </Button>
            )}
          </div>

          {/* Bouton vue compacte */}
          <Button
            variant={filters.compactView ? "primary" : "ghost"}
            onClick={handleCompactViewToggle}
            className="flex items-center gap-2"
            title={filters.compactView ? "Vue détaillée" : "Vue compacte"}
          >
            <svg 
              className="w-4 h-4" 
              fill="none" 
              stroke="currentColor" 
              viewBox="0 0 24 24"
            >
              {filters.compactView ? (
                <path strokeLinecap="round" strokeLinejoin="round" strokeWidth={2} d="M4 6h16M4 10h16M4 14h16M4 18h16" />
              ) : (
                <path strokeLinecap="round" strokeLinejoin="round" strokeWidth={2} d="M4 6h16M4 12h16M4 18h16" />
              )}
            </svg>
            {filters.compactView ? 'Détaillée' : 'Compacte'}
          </Button>

          {/* Bouton de tri */}
          <div className="relative" ref={sortDropdownRef}>
            <Button
              ref={sortButtonRef}
              variant="ghost"
              onClick={handleSortToggle}
              className="flex items-center gap-2"
            >
              <svg 
                className="w-4 h-4"
                fill="none" 
                stroke="currentColor" 
                viewBox="0 0 24 24"
              >
                <path strokeLinecap="round" strokeLinejoin="round" strokeWidth={2} d="M3 4h13M3 8h9m-9 4h6m4 0l4-4m0 0l4 4m-4-4v12" />
              </svg>
              Tris
              <svg 
                className={`w-4 h-4 transition-transform ${isSortExpanded ? 'rotate-180' : ''}`}
                fill="none" 
                stroke="currentColor" 
                viewBox="0 0 24 24"
              >
                <path strokeLinecap="round" strokeLinejoin="round" strokeWidth={2} d="M19 9l-7 7-7-7" />
              </svg>
            </Button>
            
          </div>

          <Button
            variant="ghost"
            onClick={() => setIsExpanded(!isExpanded)}
            className="flex items-center gap-2"
          >
            <svg 
              className="w-4 h-4"
              fill="none" 
              stroke="currentColor" 
              viewBox="0 0 24 24"
            >
              <path strokeLinecap="round" strokeLinejoin="round" strokeWidth={2} d="M3 4a1 1 0 011-1h16a1 1 0 011 1v2.586a1 1 0 01-.293.707l-6.414 6.414a1 1 0 00-.293.707V17l-4 4v-6.586a1 1 0 00-.293-.707L3.293 7.293A1 1 0 013 6.586V4z" />
            </svg>
            Filtres
            {activeFiltersCount > 0 && (
              <span className="bg-[var(--primary)] text-[var(--primary-foreground)] text-xs px-2 py-0.5 rounded-full font-medium">
                {activeFiltersCount}
              </span>
            )}
            <svg 
              className={`w-4 h-4 transition-transform ${isExpanded ? 'rotate-180' : ''}`}
              fill="none" 
              stroke="currentColor" 
              viewBox="0 0 24 24"
            >
              <path strokeLinecap="round" strokeLinejoin="round" strokeWidth={2} d="M19 9l-7 7-7-7" />
            </svg>
          </Button>

          {activeFiltersCount > 0 && (
            <Button
              variant="ghost"
              onClick={handleClearFilters}
              className="text-[var(--muted-foreground)] hover:text-[var(--destructive)]"
            >
              Effacer
            </Button>
          )}
        </div>

        {/* Filtres étendus */}
        {isExpanded && (
          <div className="mt-4 border-t border-[var(--border)]/50 pt-4">
            {/* Grille responsive pour les filtres */}
            <div className="grid grid-cols-1 lg:grid-cols-[auto_1fr] gap-6 lg:gap-8">
              {/* Filtres par priorité */}
              <div className="space-y-3">
                <label className="block text-xs font-mono font-medium text-[var(--muted-foreground)] uppercase tracking-wider">
                  Priorités
                </label>
                <div className="grid grid-cols-2 gap-2">
                  {priorityOptions.map((priority) => (
                    <button
                      key={priority.value}
                      onClick={() => handlePriorityToggle(priority.value)}
                      className={`flex items-center gap-2 px-3 py-2 rounded-lg border transition-all text-xs font-medium whitespace-nowrap ${
                        filters.priorities?.includes(priority.value)
                          ? 'border-cyan-400 bg-cyan-400/10 text-cyan-400'
                          : 'border-[var(--border)] bg-[var(--card)] text-[var(--muted-foreground)] hover:border-[var(--border)]'
                      }`}
                    >
                      <div 
                        className="w-2 h-2 rounded-full"
                        style={{ backgroundColor: getPriorityColorHex(priority.color) }}
                      />
                      {priority.label} ({priority.count})
                    </button>
                  ))}
                </div>
              </div>

              {/* Filtres par tags */}
              {availableTags.length > 0 && (
                <div className="space-y-3">
                  <label className="block text-xs font-mono font-medium text-[var(--muted-foreground)] uppercase tracking-wider">
                    Tags
                  </label>
                  <div className="flex flex-wrap gap-2 max-h-32 overflow-y-auto">
                    {sortedTags.map((tag) => (
                      <button
                        key={tag.id}
                        onClick={() => handleTagToggle(tag.name)}
                        className={`flex items-center gap-2 px-3 py-2 rounded-lg border transition-all text-xs font-medium ${
                          filters.tags?.includes(tag.name)
                            ? 'border-cyan-400 bg-cyan-400/10 text-cyan-400'
                            : 'border-[var(--border)] bg-[var(--card)] text-[var(--muted-foreground)] hover:border-[var(--border)]'
                        }`}
                      >
                        <div 
                          className="w-2 h-2 rounded-full" 
                          style={{ backgroundColor: tag.color }}
                        />
                        {tag.name} ({tagCounts[tag.name] || 0})
                      </button>
                    ))}
                  </div>
                </div>
              )}
            </div>

            {/* Visibilité des colonnes */}
            <div className="col-span-full border-t border-[var(--border)]/50 pt-6 mt-4">
              <ColumnVisibilityToggle
                hiddenStatuses={hiddenStatuses}
                onToggleStatus={toggleStatusVisibility}
                tasks={regularTasks}
                className="text-xs"
              />
            </div>

            {/* Résumé des filtres actifs */}
            {activeFiltersCount > 0 && (
              <div className="bg-[var(--card)]/30 rounded-lg p-3 border border-[var(--border)]/50">
                <div className="text-xs text-[var(--muted-foreground)] font-mono uppercase tracking-wider mb-2">
                  Filtres actifs
                </div>
                <div className="space-y-1 text-xs">
                  {filters.search && (
                    <div className="text-[var(--muted-foreground)]">
                      Recherche: <span className="text-cyan-400">&ldquo;{filters.search}&rdquo;</span>
                    </div>
                  )}
                  {filters.priorities?.length && (
                    <div className="text-[var(--muted-foreground)]">
                      Priorités: <span className="text-cyan-400">{filters.priorities.join(', ')}</span>
                    </div>
                  )}
                  {filters.tags?.length && (
                    <div className="text-[var(--muted-foreground)]">
                      Tags: <span className="text-cyan-400">{filters.tags.join(', ')}</span>
                    </div>
                  )}
                </div>
              </div>
            )}
          </div>
        )}
      </div>
      
      {/* Dropdown de tri rendu via portail pour éviter les problèmes de z-index */}
      {isSortExpanded && typeof window !== 'undefined' && createPortal(
        <div 
          ref={sortDropdownRef}
          className="fixed w-80 bg-[var(--card)] border border-[var(--border)] rounded-lg shadow-xl z-[9999] max-h-64 overflow-y-auto"
          style={{
            top: dropdownPosition.top,
            left: dropdownPosition.left
          }}
        >
          {SORT_OPTIONS.map((option) => (
            <button
              key={option.key}
              onClick={() => {
                handleSortChange(option.key);
                setIsSortExpanded(false);
              }}
              className={`w-full px-3 py-2 text-left text-xs font-mono hover:bg-[var(--card-hover)] transition-colors flex items-center gap-2 ${
                (filters.sortBy || 'priority-desc') === option.key
                  ? 'bg-cyan-600/20 text-cyan-400 border-l-2 border-cyan-400'
                  : 'text-[var(--muted-foreground)]'
              }`}
            >
              <span className="text-base">{option.icon}</span>
              <span className="flex-1">{option.label}</span>
              {(filters.sortBy || 'priority-desc') === option.key && (
                <svg className="w-4 h-4 text-cyan-400" fill="currentColor" viewBox="0 0 20 20">
                  <path fillRule="evenodd" d="M16.707 5.293a1 1 0 010 1.414l-8 8a1 1 0 01-1.414 0l-4-4a1 1 0 011.414-1.414L8 12.586l7.293-7.293a1 1 0 011.414 0z" clipRule="evenodd" />
                </svg>
              )}
            </button>
          ))}
        </div>,
        document.body
      )}

      {/* Dropdown des modes swimlanes rendu via portail pour éviter les problèmes de z-index */}
      {isSwimlaneModeExpanded && typeof window !== 'undefined' && createPortal(
        <div
          ref={swimlaneModeDropdownRef}
          className="fixed bg-[var(--card)] border border-[var(--border)] rounded-lg shadow-xl z-[9999] min-w-[140px]"
          style={{
            top: dropdownPosition.top,
            left: dropdownPosition.left,
          }}
        >
          <button
            onClick={() => handleSwimlaneModeChange('tags')}
            className={`w-full px-3 py-2 text-left text-xs hover:bg-[var(--card-hover)] transition-colors flex items-center gap-2 first:rounded-t-lg ${
              (!filters.swimlanesMode || filters.swimlanesMode === 'tags') ? 'bg-[var(--card-hover)] text-[var(--primary)]' : 'text-[var(--muted-foreground)]'
            }`}
          >
            🏷️ Par tags
          </button>
          <button
            onClick={() => handleSwimlaneModeChange('priority')}
            className={`w-full px-3 py-2 text-left text-xs hover:bg-[var(--card-hover)] transition-colors flex items-center gap-2 last:rounded-b-lg ${
              filters.swimlanesMode === 'priority' ? 'bg-[var(--card-hover)] text-[var(--primary)]' : 'text-[var(--muted-foreground)]'
            }`}
          >
            🎯 Par priorité
          </button>
        </div>,
        document.body
      )}
    </div>
  );
}